media: v4l2-jpeg: ignore the unknown APP14 marker

[ Upstream commit 251c0ea6ef ]

The legal identifier of APP14 is "Adobe\0",
but sometimes it may be
"This is an unknown APP marker . Compliant decoders must ignore it."
In this case, just ignore it.
It won't affect the decode result.

Fixes: b8035f7988 ("media: Add parsing for APP14 data segment in jpeg helpers")
Signed-off-by: Ming Qian <ming.qian@nxp.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/media/v4l2-core/v4l2-jpeg.c

@@ -460,7 +460,7 @@ static int jpeg_parse_app14_data(struct jpeg_stream *stream,
 	/* Check for "Adobe\0" in Ap1..6 */
 	if (stream->curr + 6 > stream->end ||
 	    strncmp(stream->curr, "Adobe\0", 6))
-		return -EINVAL;
+		return jpeg_skip(stream, lp - 2);
 
 	/* get to Ap12 */
 	ret = jpeg_skip(stream, 11);